单选题
While (remembering) mainly (for) the invention of the telephone, Alexander Graham Bell devoted his life (to) (helping the deaf).
A、
remembering
B、
for
C、
to
D、
helping the deaf
【正确答案】
A
【答案解析】
应改为remembered．根据主句主语Alexander Graham Bell和remember一词的逻辑关系，应该是被动关系，故改为过去分词remembered．
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